Latch bolt holdback



DCC- 25, 1951 w. la.v scHLAGE LATCH BOLT HOLD BACK 2 SHEETS-SHEET l Filed April l2. 1947 .....JEE 1f l w. R. SCHLAGE 2,580,196

Dec. 25, 1951 LATCH BOLT HOLD BACK 2 SHEETS-SHEET 2 Filed April 12. 1947 I INV NTOR. eve/915.5.

` ly released.

Patented Dee. 25, 1951 y U1v1frlof,fs-'rATEs PATENT OFFICE" j Calif.,l by AnnalSchlage, executrix, Burlingame,

Calif.. assignor Yto Schlage Lock Co"1fnpa'n'y, Y San c FranciscoyCalifJ, a corporation of California v l y. Application'npr'il 12, 1947, serial No. `741,039"

10 claims. (01.292-169) c kThis invention relates to a door-locklkof the night latch type, vand especially to alatch bolt hold back mechanism whereby the latch bolt of a night latch whenv retracted is automatically held in the retracted'position-until it is manual- A night latch is generally applied'as a supplement to a door already having a knob actuated latch without key or other locking means. STO

open a door thus equipped,.it is necessary t in- 10 sert a key in the nightY latch and to rotate it with one hand in order to retract the supplementary latch bolt, and, while holding that latch bolt so retracted, simultaneously to grasp and Yrotate the door knob also to retract the regular .l5

latch bolt of the door. This requires the use-of' both hands and is awkward particularlyif a person has one arm full of bundles or .is otherwise handicapped. The object of the present invention is general- 20 ly to improve and simplify the construction andV operation of locking mechanisms ofthe character described; and particularly to provide a lock of this character with a latchbolt hold back mechanism whereby when a key is inserted'and 25 rotated to retract the latch bolt, the latch bolt Will be automatically held in retracted position until manually released. This permits the key hand to be transferred to the door knob to rotate it and open the door, so that only one hand is 3o required.

A door lock of the night latch type equipped with a hold back mechanism of the character described is shown by way of illustration in the accompanying drawings, in which: c 35 Figure 1 is a vertical longitudinal cross-sec-"' tion taken on lines I-I .of Figure 2, showing the latch bolt and latch bolt housing for the most part in side elevation;

Figure 2 is a vertical transverse cross-section 40 showing the thumb turn at right angles to that 45 shown in Figure 2;

Figure 4 is a perspective view of the latch unit; Figure 5 is a perspective of the cylinder housing; the anchor bolts and spindle bar;

Figure 6 is a perspective view of the inside 50 turn unit and latch unit hold back;

Figure '7 is an enlarged perspective view of the hold back unit escutcheon plate and spindle bearing;

Figure 8 is an enlarged perspective view of the 55. hold back turn knob and spindle;

` 2 Figure 9 is an enlarged perspective view of the hold back dogsandpush button; j

Figure 10 is an enlarged perspective view of the flogging Spring; Y

Figure l1 is an enlarged perspective view of the hold back .driver cap; and p j Figure 12 is a perspective view of the unit shown in Figure 6 but lookingat the other end thereof. v

A night latch of the character or type here shown comprises a latch bolt unit A (see rFigure 4) which is provided with a latch ,bolt 2. A spindle 3 in the form Yof a barextends through a crank arm 4. This crank arm carries a crank pin 5v which engages a notch 6 formed in a retractor` bar. Whenever the spindle 'bar' v3V .is rotated, the crank arm 4 rotates with itand as the crank pin extends into the ynotchli of the retractor bar, it. will .pull said bar rearwardly to the dotted line position Ia (see Figure 1).. The latch bolt 2 is secured to the retractor bar, and is simultaneously retracted against the urgency of a spring 8 of the-.customary kind.

The spindle bar 3 maybe rotated from the outer side of thev door by insertion and rotation of a key in the unit B (see Figure 5), or the spindle bar 3 maybe rotated from the inner side of the door by a knob or turnpieceC (see 'Figuresand 12). c j

Regardless of Whether the spindle bar is rotated from the outer side vor the inner side of the door,r the latch bolt will be retracted, and the importantQfeature of the present invention is to provide'fa hold ,back or doggingimechanism which will automatically retain the latch bolt in its retracted position vagainst the urgency of the spring 8 until it is manually released.

The hold back or .clogging mechanism includes Y a base platel I5V carrying an escutcheon cap I 6.

The base` plate I 5 has a planar depression I 5a throughoutA a portion of itsarea andhas two Lholes .I'I-I'I formed therein through which anchor screws I1b-.-I1b extend. The base plate has also. a central 'opening- I8 through Whichextends a tubular spindle I9 carrying the knob or turnpiece C. The central opening I8 is extended by two diametrically opposedslots deiined by pairs of` shoulders 2020 orl'keepers. The tubularr spindle I9 has two longitudi lal slots 2I.. formed on opposite sides and having enlargements 22 at".the inner ends. Bendable lugs 23 are formed on the inner end of the tubular spindle by cutting slots 24 therein. A driver cap r25 is slid over and secured tothe inneriend of the tubularV spindle by deformation of the lugs 23. The cap 25 has its end perforated or cut to Vto the keepers or shoulders 2li-20.

form two segmental shaped openings 23a. to receive the tubular spindle between the enlargements 22 and beyond the lugs 23, and it has four lugs formed between the segmental openings arranged in pairs 25a- 25a so as to form a vertical and a horizontal slot between them.

A dogging member 251) in the shape of a flat fork (see (Figure 9) has a cylindrical push button 26 secured at one end. The dogging member has a pair of lugs 21 and a pair of radially extending lugs 28 or dogs. The inner ends of the lugs 21 extend through the horizontal slot formed between the lugs 25a- 25a ofthe cap 25and well beyond the same when the button 26 assumes the depressed position shown in'FigureZ; .When the retracted position by the dogging members 28. The operation of dogging or holding the latch bolt when retracted against the spring 8 is accordingly automatic. A person who has used a key or who has rotated the turnpiece C' can use thefsamehand'to rotate the knob of thedoor lock to open .the door.

button 25 is in its extended position as, shown in Figure 3, the legs are still in engagement -with`v The spindlebar 3 exthelug pairs 25a-25a. tends through the vertical slot formed between the lug pairs 25a-*25a and between the lugs 21 of the clogging member 251;. y This makes a connection between the spindlebar 3 and thetubular spindle I9 for simultaneous rotation,

When the several parts shown in Figures. 8 to ll'are' assembled, the cap 2,51its over and engages the end of the tubular-spindle I .9 and is' there i Secured by bendilflgihe lugs 23 outwardly. The

spindle bar 3 extends into the key unit i3Y and it also extends through the vertical slot formed between the lug pairs 25a-.25a into the interior .of the tubular spindle IS. v'I helugs 21 of the dogging member 251D mounted in the spindle |S straddle the spindle bar Sand theY lugs 28. and

are slidably disposed in the longitudinal slotsA 2| .2

A spring 30 is interposed between the driver cap 25 andl the .dogs or lugs 28.and urges the dogs or lugs intoV engagement with the depression |5a in the base plate l5.

In the normal projected position of the latch,

bolt 2, the dogging lugs 28 engage the rdepressed surface |a and are in a position at right angles v When the spindle. bar3 is rotatedeither by a key orv the turnpiece C, thelugs 28 revolve into alignment with. the slots between the keeper shoulders 20.

Z The spring 30 forces the dogging member 25h as a whole outwardly in the tubular spindle I94 into slots between the shoulders 20, and are in engagement with the depressed surface ld of the base plate l|5,.the spindle bar 3 is moved.. into its normal looked position as the latch bolt is urged into its normal. projected position by the spring 8. Whenever thespindle bar 3 isloliated either.

by the .key mechanism B or .the turnpiece C. the dogginglugs 28 register with the slots formed between the keeper Shoulders VK---2lland the ,dogging member25b then moves longitudinally dueto the pressure of the spring 30 to enter it visibly indicatesthat the latchbolt of the night4 latch is retracted and thatit is being4 held'v .in

The latch bolt will remain in the retracted position until it is manually released. Release is accomplished by pressing the push button 26 to assume the position shown in Figuref Thisv brings the dogs 28 out from betweenthe, keeper shoulders A2li- 20 so as to permit lthe yspring 8 to project the latch bolt 2 and-rotate theturnpiece C and the spindle |9 to a point: so thal'ffthe dogs 28 engage the depressed surface |5a of the base plate I5.

The Vhold `back or clogging mechanism here `shown -in applicable to several types of night latches, see for instance patents of Walter R. SchlagaNos.. 1.829.814; 1,846,364; 1,816,080 and Othersf. Allo'f .these patents' explain how the Y individual units o i the night latch are constructed and function and how they are assembled when placed in a door. While certain features of the hold back or dogging mechanism have been more or less specically described and Villustrated, it should be understood that changes may be resorted to within the scope of the ap- ,pended claims.

Having thus described the invention, what is claimed and desired tosecure by Letters Patent. is:

l; 4In a door lock, a latch bolt, rotatable means for retracting 'the latch bolt, means for automatically dogging vthe rotatable member when therlatch bolt lisin retracted position to retain the latch boltin the retracted position, and manually actuated means movable independently of and carried by the rotatable means for releasing the clogging means to release the latch bolt.

2. In a; door lock, a latch, bolt, a rotatable spindle, means actuated by rotationof the spindlefoi` retracting the latch bolt,-a dogging mem- 'ber automatically holding the spindle against Y rotationv and so holding the latch bolt against projection when the latch bolt is in retracted position, .and manually actuated means movable independently of said/spindle for releasing the dogging member to release the spindle for rotawhen the latch bolt is held in the retracted positiOIl. and means actuated by depression. of the pushV button for disengaging the dogging member to` release the spindle .and for projection of the latch bolt.V`

,4. In adoor .lock a latch bolt, a rotatable spindie, means actuated by rotation of the spindle for retracting the latch bolt, a dogging member automatislly holding. the Spindle against rotation and the latch bolt against projection when the latch bolt. is in` retracted position,.a push button Projecting from one end of the spindle when the latch bolt is'held in the retracted position, means actuated by depression of the push button for disengaging the clogging member, and spring actuated means for projecting the latch bolt when the clogging member is disengaged.-

5. In a door lock, a latch bolt, a rotatable spindle, means actuated by rotation of the spindle for retracting the latch bolt, a dogging member automatically holding the spindle against rotation and the latch bolt against projection when the latch bolt is in retracted position, and means automatically moved into a position visibly projecting from one end of the spindle when the latch bolt is hel-l in retracted position.

6. In a door lock, a latch bolt, a rotatable spindle, means actuated by rotation of the spindle for retracting the latch bolt, a dogging member automatically holding the spindle against rotation and the latch bolt against projection when the latch bolt is in retracted position, and means projecting from one end of the spindle and visibly indicating that the latch bolt is held in retracted position, said visible means being operable to disengage the dogging member and so to release the latch bolt.

7. In a door lock of the character described, a housing, a latch bolt, a spring tending to move the latch bolt into projected position, a spindle journaled in the housing, means actuated by rotation of the spindle for moving the latch bolt into retracted position, a dogging member rotatable with and slidable longitudinally in the spindle, a stationary keeper to receive the clogging member only when the latch bolt is in retracted po-sition, a spring tending to move the clogging member into engagement with the keeper, and a push button carried by the dogging member and projecting from one end of the spindle when the clogging member is in engagement with the keeper.

8. In a door lock, a latch bolt, a spring for urging said latch bolt into projected position, ya spindle, means actuated by rotation of the spindle for moving the latch bolt into retracted position and compressing said spring, a springpressed retainer for holding the latch bolt in retracted position only, and a manual button carried by the spindle for withdrawing the springpressed retainer and releasing the latch :bolt for movement into projected position under urgency of said spring.

9. A latch bolt hold back comprising a housing, a latch bolt movable between projected and retracted positions in said housing, a spring urging said latch bolt into projected position, a base plate stationary with respect to said housing, a hollow spindle rotatable in said base plate and engaging said latch bolt, a dogging member within and keyed to said spindle and projecting therefrom to rotate with said spindle relative to said base plate, means holding said clogging member against rotation with respect to said base plate only when said spindle is in a rotated position corresponding to the retracted position of said latch bolt, and a manual button for releasing said dogging member from said holding means.

10. A latch bolt hold back comprising a spring, a base plate, a spindle rotatable in said base plate between a irst position corresponding to a deenergized position of said spring and a second position corresponding to an energized position of said spring, a clogging member keyed to said spindle and rotatable therewith, means for interlocking said dogging member and said base plate only in said second position of said spindle to hold said spring in energized position, and a manual button carried by said spindle for disengaging said interlocking means and releasing said spring to deenergized position.

ANNA SCHLAGE,

Executrz'x of the Estate of Walter R. Schlage,

Deceased.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,230,774 Pollock June 19, 1917 1,443,600 Tonsager Jan. 30, 1923 1,559,037 Floyd Oct. 27, 1925 

